This cooling system consists of two charge air coolers which cool the charge air, a water circuit which flows through a pump, into the charge air coolers and into a heat exchanger which then cools the water that has been used by the charge air coolers to cool the compressed air.
As boost pressure is increased as is common with any ECU software upgrade (Stage 1/2/3) this introduces more heat into the charge air cooling system. The stock charge air cooling system works very well for stock boost levels, however, once boost levels are raised it can struggle to keep charge air temperatures consistently cool.
The CSF All-Aluminum Heat Exchanger (Charge Cooler Water Radiator) improves the cooling power of the stock heat exchanger which cools the water that cools the charge air. With a more powerful heat exchanger, it can more effectively remove heat from the hot water to help keep charge air temperatures cooler and improve resistance to heat soak.
In independent testing at Regal Autosport, they found that the Heat Exchanger can reduce charge air temperatures by as much as 20 degrees at their peak and improve resistance to heat-soak by 4 times when compared to the stock heat exchanger.